Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vang cao » nang cao, lang cao, vang tao
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thuc dan » thuc hanh, hoc dan, thuc vat
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly vang » ly hang, ly van, ly quang
cao hoi » cau hoi, co hoi, cao hoc
hang vi » hanh vi, hang di, khang voi
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: te sach ly vang cao hoi. hieu van pham thuc dan ((hang vi) OR (hang va)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly vang cao hoi. hieu van pham thuc dan ((hang vi) OR (hang va)) cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ly vang cao hoi. hieu van pham thuc dan ((hang vi) OR (hang va)) cua te*.