Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
lang thai » lang chai, dang thai, lang hai
hieu van » hieu va, thien van, hieu ve
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
va lang » va nang, hoa lang
y nang » ky nang, ly nang, v nang
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 y nang xa hoi. ((hieu van) or (lieu va)) dat (nuoc OR quoc) va lang thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang xa hoi. ((hieu van) OR (lieu va)) dat (nuoc OR quoc) va lang thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang xa hoi. ((hieu van) or (lieu va)) dat (nuoc OR quoc) va lang thai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang xa hoi. ((hieu van) or (lieu va)) dat (nuoc OR quoc) va lang thai cua te*.