Perhaps you should try some spelling variations:
thang hanh » thang thanh, tang hanh, thanh thanh
duc thang » duc tan, duc hung
hanh mau » thanh mau, anh mau, hanh ma
va trien » va truyen, va tuyen, va tieng
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam
y lang » o lang, _ lang, tay lang
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) y lang xa hoi. hieu ve cam duc thang hanh mau ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y lang xa hoi. hieu ve cam duc thang hanh mau ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) y lang xa hoi. hieu ve cam duc thang hanh mau ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y lang xa hoi. hieu ve cam duc thang hanh mau ((va trien) OR (va thiet))*.