Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang thai » dang thi, dang hai, dang khai
thai cua » than cua, tai cuc, tri cua
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
van dat » van dao, dan dat, van dan
van dau » van dao, phan dau
va dang » van dang, va nang, va lang
nang xa » nang x, lang xa, mang xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang xa) OR (nang ma)) hoi. thien ((van dat) or (van dau)) nuoc va dang thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. thien ((van dat) OR (van dau)) nuoc va dang thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) OR (nang ma)) hoi. thien ((van dat) or (van dau)) nuoc va dang thai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) OR (nang ma)) hoi. thien ((van dat) or (van dau)) nuoc va dang thai cua te*.